关于有時也被稱為T-waves的電磁輻射，请见「兆赫輻射」。在心电图學中，T波（T wave）代表的是心室的再極化。自QRS複合波的起點到T波的頂點這一段被稱為絕對乏興奮期（absolute refractory period）。T波後半則稱為相對乏興奮期（relative refractory period）。T波具有意義的形態描述包含對稱性（symmetry）、偏移（skewness）、上升段即下降段的斜率、振幅（amplitude）。
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T波倒轉（T wave Inverted，TWI）表示T波的指向與正常指向相反。病理性的倒轉形態包含對稱性或深的T波倒轉，可能表示冠心性缺血、Wellens症候群、左心室肥大，或中樞神經系統疾病。其他原因如下：
心房性早期收縮 premature atrial contraction（PAC） 遊走性心房節律點 wandering atrial pacemaker 多源性心房頻脈 multifocal atrial tachycardia 心房撲動 atrial flutter 心房顫動 atrial
short-QT syndrome 1 rabbits mimic the human disease phenotype with QT/action potential duration shortening in the atria and ventricles and increased ventricular
interval timing, leading to the hypothesis that dopamine influences internal pacemaker, or “clock,” activity. For instance, amphetamine, which increases concentrations
Spider China (WS) Energy Pacemaker (EP) Snake Esports：後更名LNG电子竞技俱乐部 (LNG)。 Vici Gaming：後更名Rare Atom。 Team King Unlimited Potential Masters 3 Gamtee Young
J.D.; Imbrie, J.; Shackleton, N.J. Variations in the Earth's Orbit: Pacemaker of the Ice Ages. Science. 1976, 194 (4270): 1121–1132. PMID 17790893.
interval timing, leading to the hypothesis that dopamine influences internal pacemaker, or “clock,” activity. For instance, amphetamine, which increases concentrations
